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Submitted on: 07 October 2006.
Revised on: 22 January 2007.
Accepted on: 25 February 2007.
___________________IET Image Processing---WILEY
Submitted on: 22 February 2009.
Revised on: 21 June 2009.
Accepted on: 13 July 2009.
___________________IET Image Processing---WILEY
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